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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 4 |
| 4 | -23 |
| 5 | 183 |
| 6 | -1459 |
| 7 | 13592 |
| 8 | -153348 |
| 9 | 1975117 |
| 10 | -28287606 |
| 11 | 449154660 |
| 12 | -7849907559 |
| 13 | 149555531331 |
| 14 | -3083839320171 |
| 15 | 68448665226744 |
| 16 | -1627353764342224 |
| 17 | 41258541219292569 |
| 18 | -1111163801421888834 |
[0,1,-2,4,-23,183,-1459,13592,-153348,1975117, -28287606,449154660,-7849907559,149555531331, -3083839320171,68448665226744,-1627353764342224, 41258541219292569,-1111163801421888834] |